-- AP2.2e: Sprint-Planung — Item-Arten, Feature-Referenz, Unplan-Support

ALTER TABLE actions DROP CONSTRAINT IF EXISTS actions_action_kind_check;
ALTER TABLE actions
    ADD CONSTRAINT actions_action_kind_check
        CHECK (action_kind IN ('delivery', 'planning', 'review', 'bug', 'issue'));

ALTER TABLE actions
    ADD COLUMN IF NOT EXISTS parent_action_id UUID NULL
        REFERENCES actions (id) ON DELETE SET NULL;

CREATE INDEX IF NOT EXISTS idx_actions_parent
    ON actions (tenant_id, initiative_id, parent_action_id)
    WHERE parent_action_id IS NOT NULL;

ALTER TABLE backlog_items
    ADD COLUMN IF NOT EXISTS item_kind VARCHAR(32) NOT NULL DEFAULT 'story'
        CHECK (item_kind IN ('story', 'bug', 'issue'));

ALTER TABLE backlog_items
    ADD COLUMN IF NOT EXISTS parent_action_id UUID NULL
        REFERENCES actions (id) ON DELETE SET NULL;

CREATE INDEX IF NOT EXISTS idx_backlog_parent_action
    ON backlog_items (tenant_id, initiative_id, parent_action_id)
    WHERE parent_action_id IS NOT NULL;